Eleoteio elevatoe



(No Model.) 2 Sheets-Sheet 1.

N. P. OTIS. ELECTRIC BLBVATOR.

No. 513,134. Patented Jan. 23,1894.

(No Model.) 2 Sheets-Sheet 2. N. P. OTIS. ELECTRIC BLEVATOR.

Patented Jan. 23, 1894.

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./Qttorneys.

WYTNESSES l Muon. um cow-ANY.

Imran. n. c.

UNITED STATES PATENT OFFICE.

NORTON P. OTIS, OF YONKERS, ASSIGNOR TO THE OTIS BROTHERS & COMPANY, OFNEV YORK, N. Y.

ELECTRIC ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 513,134, dated January23, 1894.

Application filed June 25, 1890. Serial No. 356,689. (No model.)

To a/ZZ whom it may concern:

Be it known that I, NORTON I. OTIS, a citizen of the United States,residing at Yonkers, Westchester county,New York, have invented certainnew and useful Improvements in Elevating Apparatus, of which thefollowing is a specification.

My invention relates to that class of elevator apparatus in whichelectricity is the motive power and my invention consists in means fullyset forth hereinafter for controlling the current and both by theoperator and automatically.

In the accompanying drawingsz-Figure l is a side elevation of suflicientof an elevator and electric operating engine and appliances toillustrate my invention. Fig. 2 is an enlarged view of a currentcontroller and adj unct.

A represents an electric motor which may be of any suitableconstruction, the armature 13, being upon a shaft a, turning in bearingsb, b, said armature revolving,r between the poles of a field magnet 12.

Upon the shaft a, or upon a shaft connected to the shaft a, are arrangedtwo reverse worms 47, 48, each of which gears with a worin-wheel c, thetwo worm Wheels gearing together, and upon one of the shafts 7, of oneof the wormwheels is a drum D, round which is wound the flexible cableor suspensory that is connected with the platform or cage X, so that thelatter is raised or lowered accordingly as the drum is turned in onedirection or the other by the revolution of the armature in onedirection or the other.

In order to raise and lower the cage and counterbalancing weight byreversing the rotation of the drum, it is necessary to reverse thearmature, and in order to vary the speed of the cage that of thearmature must be varied, and I therefore make use of means for reversingand varying the strength of the current passing through the motor, andfor this purpose l employ a current controller B, of any suitablecharacter, as, for instance, a series of resistance coils 41, 42, shownin dotted lines Fig. 2, of a switch or cut-out 40, carried by a shaft 4,so as to be moved over said coils, and so connected with the conductors20, 2l and arranged in respect to resistance terminals c, c', inconnection with the properly wound armature and magnet, that themovement of the switch, Fig. l, to one side will close the circuit ofthe resistance and gradually cut out the resistance to impart motion tothe armature in one direction, while the movement to the other side willgradually cut out the resistance to impart movement to the armature inthe other direction.

The required changes in the position of the switch may be imparted fromthe car by the operator in any suitable manner. Thus, an ordinary handrope q, passing through the ear and over an upper guide pulley, (asusual,) passes also round a grooved pulley 5, on the shaft 4, so thatthe operator may shift the switch by manipulating said hand rope.

In order that the switch maybe maintained in its position when theresistance has been properly cut out to either side to avoid thenecessity when the engine is running properly of the operatormaintaining continuous hold upon the hand rope or other operatingappliance, I make use of a detent I, for locking the switch in anyposition to which it is set until sufficient force is exercised by theoperator to overcome the force of the detent, and I also make use ofsprings or other motor for automatically shifting the switch to its midposition whenever the detent is withdrawn. These parts maybe constructedin various ways; but as shown there is a disk 3, connected to the shaft4, and to which are also connected on opposite sides of the shaft twosprings 6, 6, which tend to carry the parts to the position shown inFig. 1, whenever they are released from any other controlling influence.The detent as shown consists of a bolt 8, sliding between guides 9, 9,and having a double beveled end adapted to V-shaped notches 10, in theedge of the disk 3. W'henever the disk is turned to any position towhich it must be set, and the bolt drops into one of the notches it willhold the disk against the power of the springs, but the application ofsufficient force of the operator of the cage will turn the disk andforce the bolt from the notch.

To protect the apparatus against the injurious results -of thetransmission of too powerful a current over the main line from ssv ' maloperation of the apparatus.

any cause, I place in the main` circuit a fuse s, in connection withdevices whereby the burning out of said fuse will unlock the detent Iand cause the switch to be automatically thrown to a central position,so that it' by any accident the current should then be restored nooperation of the apparatus would take place. As shown iu the drawings,one

of the lead wires 20, is connected with abinding post 22, which in turnhas suitable electrical connections with the resistance coils, suchconnection, however, being not shown. The other lead wire 21 is shown asbeing connected with a binding post 22', and with this latter bindingpost the fuse s has electrical connection. One means of thus unlockingthe bolt consists of a lever t, pivoted upon the frame of a machine andconnected to one end of a fuse s, a spring 2, tending to draw down oneend of the lever against the tension of the fuse. The level' t, is alsoconnected by a strap or cord 1 0, with the bolt 8, which can thus moveup and down independently of the lever to a suicient extent to permitthe nor- If,`however, the fuse should burn away the spring 2, will actto tip the lever, which will let the bolt out of the notch and thesprings 6, 6, will then restore the parts to their normal position.

In order that thek operator may know when the parts are in their normalposition I place upon the cage X, any suitable electrical indicator oralarm T, in circuit with a battery and with a circuit breaker P, onemember 14, of which is connected to the frame of the apparatus and toonel portion of the circuit wire, while the other member 15, isconnected with another portion of the circuit wire and is carried by thedisk, so as to make contact with the membery 14, complete the circuit,and sound the alarm whenever the switch is in its normal ormid-position. The members 14 and 15, are of course insulatedupon theirsupports. v Without limiting myself to the precise construction andarrangement of parts shown` and described, I claiml. The combinationwith the cage and ele- 'release the switch upon the burning of the fuse,substantially as set forth.

2. The combination with the cage and electric elevating engine, of acurrent controller,

means for automatically carrying the latter to a certain position, adetent for holding the controller in the position to which it may beset, the detent being freely movable, means which tend to withdraw thedetent from engagement with the controller, and a fuse in the maincircuit which holdsthe-said means from operation so'longas the fuse isnot destroyed, substantially as set forth.

3. The combination with the cage, and the electric elevating engine,of.- a currentv controller, means for automatically carrying the latterto a certain position, a sliding bolt 8 which operates as a detent tohold the con troller in the position to which it may be set, a leverT'to which the detent is connected by a strap or cord w, aspring whichtendsy to.

move the lever so as to 4move the bolt away from the controller, and afuse s in the main circuit which holds the said lever in position topermit the detentto operate, substantially as set forth. v

4. The combination with the cage and the electric elevating engine, of acurrent controllerconsistingof a switch and a disk 3, the two springs 6,6, connected on opposite sides of the center of the said disk andtending to restore it to a mid-position, and means'wh'ereby the saidswitch can be operated, substantially as set forth.

In testimony. whereof I have signedl my name to this specification i-nthe presence of two subscribing` witnesses.

NORTONV P. OTIS.

Witnesses:

CHARLES-H. FULLER, J. P. WOODRUFF.

